Gardaí and emergency services attended the scene of a road traffic collision on the R671 at Ballymacarbry this afternoon.
The incident occurred at approximately 4.30pm and involved a van and a pedestrian.
The pedestrian, a female (youth) was later taken to CHI at Temple Street in Dublin where she is currently receiving treatment for serious injuries.
The driver of the van was unharmed.
The road will remain closed overnight. A forensic collision examination is due to take place tomorrow morning. Local diversions are currently in place.
Gardaí are appealing to any person who may have witnessed this collision to contact them. Any road users who were travelling on the R671 between 4.25pm and 4.40pm and who has camera (including dash cam) footage, is asked to make this available to Gardaí.
People who can assist in the investigation are asked to contact Dungarvan Garda Station at 058 48 600, the Garda Confidential Line on 1800 666 111 or any Garda Station.